import Link from 'next/link';
import { prisma } from '@/lib/prisma';
import { StatusCard } from '@/components/admin/dashboard';
import { Clock } from 'lucide-react';
import { getTranslations } from "next-intl/server";

export const dynamic = 'force-dynamic';

type History = {
  id: bigint;
  userId: bigint;
  showName: string | null;
  startedAt: Date;
  endedAt: Date | null;
  listenersCount: number;
  notes: string | null;
};

function formatDate(d: Date | null): string {
  return d ? d.toISOString().slice(0, 16).replace('T', ' ') : '\u2014';
}

function formatDuration(start: Date, end: Date | null): string {
  if (!end) return '\u2014';
  const ms = end.getTime() - start.getTime();
  if (ms <= 0) return '\u2014';
  const mins = Math.round(ms / 60000);
  const h = Math.floor(mins / 60);
  const m = mins % 60;
  return h > 0 ? `${h}h ${m}m` : `${m}m`;
}

export default async function AdminRadioHistoryPage() {
  const t = await getTranslations("pages.admin.radio");

  let history: History[] = [];
  let names = new Map<string, string>();
  let dbError = false;

  try {
    history = await prisma.radioHistory.findMany({
      select: {
        id: true,
        userId: true,
        showName: true,
        startedAt: true,
        endedAt: true,
        listenersCount: true,
        notes: true,
      },
      orderBy: { startedAt: 'desc' },
      take: 100,
    });

    const ids = Array.from(new Set(history.map((h) => Number(h.userId)))).filter(
      (n) => Number.isFinite(n) && n > 0,
    );
    if (ids.length > 0) {
      const users = await prisma.user.findMany({
        where: { id: { in: ids } },
        select: { id: true, username: true },
      });
      names = new Map(users.map((u) => [String(u.id), u.username]));
    }
  } catch {
    dbError = true;
    history = [];
  }

  const liveCount = history.filter((h) => !h.endedAt).length;
  const peakListeners = history.reduce(
    (max, h) => (h.listenersCount > max ? h.listenersCount : max),
    0,
  );
  const uniqueDjs = new Set(history.map((h) => String(h.userId))).size;

  return (
    <main>
      <nav className="text-xs text-gray-500 dark:text-gray-400 mb-2">
        <Link href="/admin/radio">{t("title")}</Link> ·{' '}
        <Link href="/admin/radio/settings">{t("settings")}</Link> ·{' '}
        <Link href="/admin/radio/banners">{t("banners.title")}</Link> ·{' '}
        <Link href="/admin/radio/ranks">{t("ranks")}</Link> ·{' '}
        <Link href="/admin/radio/history">{t("history")}</Link>
      </nav>

      <div className="flex items-center gap-3 mb-6">
        <div className="w-10 h-10 rounded-xl bg-gradient-to-br from-[var(--color-primary)]/20 to-[var(--color-primary)]/5 grid place-items-center">
          <Clock size={20} className="text-[var(--color-primary)]" />
        </div>
        <div>
          <h1 className="m-0 text-xl font-extrabold text-[var(--color-text)]">{t("historyPage.title")}</h1>
          <p className="m-0 text-xs text-[var(--color-text-muted)] mt-0.5">{t("historyPage.subtitle")}</p>
        </div>
      </div>

      {dbError ? (
        <div className="admin-card mb-6">
          <p className="text-xs text-gray-500 dark:text-gray-400 m-0">
            {t("historyPage.dbError")}
          </p>
        </div>
      ) : (
        <div className="grid grid-cols-[repeat(auto-fit,minmax(180px,1fr))] gap-3.5 mb-6">
          <StatusCard label={t("historyPage.showsLogged")} value={history.length} icon="\u{1F399}\uFE0F" />
          <StatusCard
            label={t("historyPage.onAirNow")}
            value={liveCount}
            state={liveCount > 0 ? 'ok' : 'neutral'}
            icon="\u{1F534}"
          />
          <StatusCard label={t("historyPage.uniqueDjs")} value={uniqueDjs} icon="\u{1F9D1}\u200D\u{1F3A4}" />
          <StatusCard label={t("historyPage.peakListeners")} value={peakListeners} icon="\u{1F465}" />
        </div>
      )}

      {!dbError && history.length === 0 ? (
        <div className="admin-empty">{t("historyPage.empty")}</div>
      ) : null}

      {history.length > 0 ? (
        <section className="mt-6">
          <h2 className="admin-section-title">{t("historyPage.showLog", { count: history.length })}</h2>
          <table>
            <thead>
              <tr>
                <th>ID</th>
                <th>{t("historyPage.colDj")}</th>
                <th>{t("historyPage.colShow")}</th>
                <th>{t("historyPage.colStarted")}</th>
                <th>{t("historyPage.colEnded")}</th>
                <th>{t("historyPage.colAirtime")}</th>
                <th>{t("historyPage.colListeners")}</th>
                <th>{t("historyPage.colNotes")}</th>
              </tr>
            </thead>
            <tbody>
              {history.map((h) => (
                <tr key={String(h.id)}>
                  <td>{String(h.id)}</td>
                  <td>{names.get(String(h.userId)) ?? `#${String(h.userId)}`}</td>
                  <td>{h.showName ?? '\u2014'}</td>
                  <td className="text-sm text-gray-500 dark:text-gray-400 whitespace-nowrap">{formatDate(h.startedAt)}</td>
                  <td>
                    {h.endedAt ? (
                      <span className="text-sm text-gray-500 dark:text-gray-400">{formatDate(h.endedAt)}</span>
                    ) : (
                      <span className="inline-block text-[0.72rem] font-bold px-2 py-0.5 rounded-full bg-green-600/20 text-[var(--color-text)]">{t("historyPage.onAir")}</span>
                    )}
                  </td>
                  <td className="text-sm text-gray-500 dark:text-gray-400 whitespace-nowrap">{formatDuration(h.startedAt, h.endedAt)}</td>
                  <td>{h.listenersCount}</td>
                  <td className="text-sm text-gray-500 dark:text-gray-400 whitespace-nowrap">{h.notes ?? '\u2014'}</td>
                </tr>
              ))}
            </tbody>
          </table>
        </section>
      ) : null}
    </main>
  );
}